JVC LT19D200 - 19" LCD TV User manual

SERVICE MANUAL
COPYRIGHT © 2009 Victor Company of Japan, Limited No.YA711<Rev.002>
2009/8
LCD TELEVISION BUILT-IN DVD PLAYER
YA711<Rev.002>20097SERVICE MANUAL
LT-19D200/AK
COPYRIGHT © 2009 Victor Company of Japan, Limited
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
MODEL NO.
RATING LABEL (REAR)
AK
VERSION
LT-19D200
MODEL NAME
There may be multiple versions of
this TV model.
The TV version is identified by the
letters next to the model number
on the TV's Rating.
(See illustration).
Use the service manual that
matches the version of the TV.
HIGH DEFINITION TELEVISION

1-2 (No.YA711<Rev.002>)
SPECIFICATION
Design & specifications are subject to change without notice.
Items Contents
Dimensions ( W ×H ×D ) 47.75 cm ×36.58 cm ×21.0 cm (18.8" ×14.5" ×8.3") [with stand]
47.75 cm ×33.04 cm ×13.47 cm (18.8" ×13.1" ×5.4") [without stand]
Mass 4.5 kg (10.0 lbs) [with stand]
4.1 kg (9.1 lbs) [without stand]
Power Input AC120 V , 60 Hz
Power Consumption 65 W (Max)
TV RF System
(Analog / Digital)
Analog
Digital
CCIR (M)
ATSC terrestrial / Digital cable
Color System (Analog) NTSC
Stereo System (Analog) BTSC (Multi Channel Sound)
Teletext System (Analog) Closed caption (T1-T4 / CC1-CC4)
TV Receiving Channels
and Frequency (Analog)
VHF Low
VHF High
UHF
CATV
02 ch - 06 ch : 54 MHz - 88 MHz
07 ch - 13 ch : 174 MHz - 216 MHz
14 ch - 69 ch : 470 MHz - 806 MHz
54 MHz - 804 MHz
Low Band : 02 - 06
High Band : 07 - 13
Mid Band : 14 - 22
Super Band : 23 - 36
Hyper Band : 37 - 64
Ultra Band : 65 - 94, 100 - 135
Sub Mid Band : 01, 96 - 99
TV / CATV Total Channel 191 Channels
Intermediate Frequency
(Analog)
Video IF
Sound IF
45.75 MHz
41.25 MHz (4.5 MHz)
Color Sub Carrier Frequency (Analog) 3.58 MHz
LCD Panel 19" class (18.5" Diagonal) wide aspect (16 : 9)
Display Pixels Horizontal : 1366 dots ×Vertical : 768 dots (W-XGA)
Audio Power Output 1 W + 1 W
Speaker Oval type ×2
Discs (Playback compatibility) DVD video, DVD-RW/-R, DVD+RW/+R, audio CD, video CD, CD-RW/-R
Frequency response DVD (linear sound) 20 Hz to 20 kHz (sample rate: 48 kHz), 20 Hz to 44 kHz (sample rate: 96 kHz)
CD 20 Hz to 20 kHz
Signal-to-noise ratio (S/N ratio) CD: 90 dB (JEITA)
Total distortion factor DVD 1 KHz 0.007% (JEITA)
CD 1 KHz 0.007% (JEITA)
Antenna Terminal
(VHF/UHF, ATSC / DIGITAL CABLE IN)
F-type connector, 75Ωunbalanced, coaxial ×1
Video / Audio Input
[VIDEO]
S-Video Mini-DIN 4 pin ×1
Y: 1 V (p-p), Positive (Negative sync.), 75 Ω
C: 0.286V (p-p) (Burst signal), 75 Ω
Video 1 V (p-p), Positive (Negative sync.), 75 Ω, RCA pin jack ×1
Audio 500 mV (rms), High impedance, RCA pin jack ×2
Video / Audio Input
[COMPONENT]
Component Video
1080i / 720p
480p / 480i
RCA pin jack ×3
Y : 1 V (p-p) (Sync signal: 0.35V(p-p), 3-value sync.), 75 Ω
Pb/Pr : ±0.35V(p-p), 75 Ω
Y : 1 V (p-p), Positive (Negative sync.), 75 Ω
Cb/Cr : 0.7V(p-p), 75 Ω
Audio 500 mV (rms), High impedance, RCA pin jack ×2
Digital Input Digital(Video/Audio) HDMI 2-row 19pin connector ×1
(Digital-input terminal is not compatible with picture signals of personal computer)
Video: Supported format: 1080i / 720p / 480p / 480i
Audio: 2ch L-PCM, 32 / 44.1 / 48 KHz, 16 / 20 / 24 bit
Analog (Audio) 500mV(rms) (-4dBs), high impedance, RCA pin jack ×2
PC (RGB) Input Video D-sub 15 pin ×1
R/G/B : 0.7 V (p-p), 75Ω
HD / VD : 1 V (p-p) to 5 V (p-p), high impedance
Audio 3.5 mm stereo mini jack ×1
Digital Audio output 500 mV (rms), Coaxial ×1
Remote Control Unit RM-C2152 (AA/R6 battery ×2)

(No.YA711<Rev.002>)1-3
SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS
(1) The design of this product contains special hardware,
many circuits and components specially for safety
purposes. For continued protection, no changes should be
made to the original design unless authorized in writing by
the manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be
performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or
property damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These
characteristics are often not evident from visual inspection
nor can the protection afforded by them necessarily be
obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components
having such features are identified by shading on the
schematics and by ( ) on the parts list in Service
manual. The use of a substitute replacement which does
not have the same safety characteristics as the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.
(4) Don't short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing.
Some model's power circuit is partly different in the GND.
The difference of the GND is shown by the LIVE : ( ) side
GND, the ISOLATED (NEUTRAL) : ( ) side GND and
EARTH : ( ) side GND.
Don't short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). If above note will
not be kept, a fuse or any parts will be broken.
(5) When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.
(6) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an
isolation check on the exposed metal parts of the cabinet
(antenna terminals, video/audio input and output terminals,
Control knobs, metal cabinet, screw heads, earphone jack,
control shafts, etc.) to be sure the product is safe to operate
without danger of electrical shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second. (.
. . . Withstand a voltage of 1100V AC (r.m.s.) to an
appliance rated up to 120V, and 3000V AC (r.m.s.) to an
appliance rated 200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis,
to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use
an AC voltmeter having 1000Ωper volt or more
sensitivity in the following manner. Connect a 1500Ω
10W resistor paralleled by a 0.15µF AC-type capacitor
between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part,
particularly any exposed metal part having a return path
to the chassis, and measure the AC voltage across the
resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage measured must
not exceed 0.75V AC (r.m.s.). This corresponds to
0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500 10W
0.15 F AC-TYPE
GOOD EARTH GROUND

1-4 (No.YA711<Rev.002>)
1.2 LASER BEAM SAFETY PRECAUTIONS
This DVD player uses a pickup that emits a laser beam.
The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep your eyes at least 30
cm away from the pickup lens when the diode is turned on. Do not look directly at the laser beam.
CAUTION:
Use of controls and adjustments, or doing procedures other than those specified herein, may result in hazardous radiation exposure.
Do not look directly at the laser beam coming
from the pickup or allow it to strike against your
skin.
Location: Top of LCD module.
Drive Mechanism
Assembly
Laser Beam Radiation
Laser Pickup
Turntable

(No.YA711<Rev.002>)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 STANDARD NOTES FOR SERVICING
2.1.1 CIRCUIT BOARD INDICATIONS
(1) The output pin of the 3 pin Regulator ICs is indicated as
shown.
(2) For other ICs, pin 1 and every fifth pin are indicated as
shown.
(3) The 1st pin of every male connector is indicated as shown.
2.1.2 INSTRUCTIONS FOR CONNECTORS
(1) When you connect or disconnect the FFC (Flexible Foil
Connector) cable, be sure to first disconnect the AC cord.
(2) FFC (Flexible Foil Connector) cable should be inserted
parallel into the connector, not at an angle.
2.1.3 PB (LEAD) FREE SOLDER
Pb free mark will be found on PCBs which use Pb free
solder. (Refer to figure.) For PCBs with Pb free mark, be sure
to use Pb free solder. For PCBs without Pb free mark, use
standard solder.
2.1.4 HOW TO REMOVE / INSTALL FLAT PACK-IC
2.1.4.1 REMOVAL
WITH HOT-AIR FLAT PACK-IC DESOLDERING MACHINE:
(1) Prepare the hot-air flat pack-IC desoldering machine,
then apply hot air to the Flat Pack-IC (about 5 to 6
seconds). (Fig.2-1)
Fig.2-1
(2) Remove the flat pack-IC with tweezers while applying
the hot air.
(3) Bottom of the flat pack-IC is fixed with glue to the PWB;
when removing entire flat pack-IC, first apply soldering
iron to center of the flat pack-IC and heat up. Then
remove (glue will be melted). (Fig.2-6)
(4) Release the flat pack-IC from the PWB using tweezers.
(Fig.2-6)
CAUTION:
(1) The Flat Pack-IC shape may differ by models. Use an
appropriate hot-air flat pack-IC desoldering machine,
whose shape matches that of the Flat Pack-IC.
(2) Do not supply hot air to the chip parts around the flat
pack-IC for over 6 seconds because damage to the
chip parts may occur. Put masking tape around the flat
pack-IC to protect other parts from damage. (Fig.2-2)
(3) The flat pack-IC on the PWB is affixed with glue, so be
careful not to break or damage the foil of each pin or
the solder lands under the IC when removing it.
Fig.2-2
Top View
Out In
Bottom View
Input
5
10
Pin 1
Pin 1
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
Pb free mark
Hot-air
Flat Pack-IC
Desoldering
Machine
CBA
Flat Pack-IC
Tweezers
Masking
Tape

1-6 (No.YA711<Rev.002>)
WITH SOLDERING IRON:
(1) Using desoldering braid, remove the solder from all pins
of the flat pack-IC. When you use solder flux which is
applied to all pins of the flat pack-IC, you can remove it
easily. (Fig.2-3)
Fig.2-3
(2) Lift each lead of the flat pack-IC upward one by one,
using a sharp pin or wire to which solder will not adhere
(iron wire). When heating the pins, use a fine tip
soldering iron or a hot air desoldering machine. (Fig.2-4)
Fig.2-4
(3) Bottom of the flat pack-IC is fixed with glue to the PWB;
when removing entire flat pack-IC, first apply soldering
iron to center of the flat pack-IC and heat up. Then
remove (glue will be melted). (Fig.2-6)
(4) Release the flat pack-IC from the PWB using tweezers.
(Fig.2-6)
WITH IRON WIRE:
(1) Using desoldering braid, remove the solder from all pins
of the flat pack-IC. When you use solder flux which is
applied to all pins of the flat pack-IC, you can remove it
easily. (Fig.2-3)
(2) Affix the wire to a workbench or solid mounting point, as
shown in Fig.2-5.
(3) While heating the pins using a fine tip soldering iron or
hot air blower, pull up the wire as the solder melts so as
to lift the IC leads from the PWB contact pads as shown
in Fig.2-5.
(4) Bottom of the flat pack-IC is fixed with glue to the PWB;
when removing entire flat pack-IC, first apply soldering
iron to center of the flat pack-IC and heat up. Then
remove (glue will be melted). (Fig.2-6)
(5) Release the flat pack-IC from the PWB using tweezers.
(Fig.2-6)
NOTE:
When using a soldering iron, care must be taken to ensure
that the flat pack-IC is not being held by glue. When the flat
pack-IC is removed from the PWB, handle it gently because
it may be damaged if force is applied.
Fig.2-5
Fig.2-6
Flat Pack-IC Desoldering Braid
Soldering Iron
Fine Tip
Soldering Iron
Sharp
Pin
To Solid
Mounting Point
Soldering Iron
Iron Wire
or
Hot Air Blower
Fine Tip
Soldering Iron
CBA
Flat Pack-IC
Tweezers

(No.YA711<Rev.002>)1-7
2.1.4.2 INSTALLATION
(1) Using desoldering braid, remove the solder from the foil of
each pin of the flat pack-IC on the PWB so you can install
a replacement flat pack-IC more easily.
(2) The zmark on the flat pack-IC indicates pin 1. (See Fig.2-
7.) Be sure this mark matches the 1 on the PCB when
positioning for installation. Then presolder the four corners
of the flat pack-IC. (See Fig.2-8.)
(3) Solder all pins of the flat pack-IC. Be sure that none of the
pins have solder bridges.
Fig.2-7
Fig.2-8
2.1.5 INSTRUCTIONS FOR HANDLING SEMI-
CONDUCTORS
Electrostatic breakdown of the semi-conductors may occur due
to a potential difference caused by electrostatic charge during
unpacking or repair work.
2.1.5.1 Ground for Human Body
Be sure to wear a grounding band (1MΩ) that is properly
grounded to remove any static electricity that may be charged on
the body.
2.1.5.2 Ground for Workbench
Be sure to place a conductive sheet or copper plate with proper
grounding (1MΩ) on the workbench or other surface, where the
semi-conductors are to be placed. Because the static electricity
charge on clothing will not escape through the body grounding
band, be careful to avoid contacting semi-conductors with your
clothing.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Presolder
CBA
Flat Pack-IC
<I n c o rr ec t >
CBA
Grounding Band
Conductive Sheet or
Copper Plate
1M
1M
< C o rr ec t >
CBA

1-8 (No.YA711<Rev.002>)
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY FLOWCHART
This flowchart indicates the disassembly steps for the cabinet
parts, and the PWB in order to gain access to item(s) to be ser-
viced. When reassembling, follow the steps in reverse order.
Bend, route and dress the cables as they were.
3.2 DISASSEMBLY METHOD
[1] Stand
Assembly
[4] DVD
Mechanism
[5] DVD Main
PWB Unit
[2] Rear Cabinet [16] Junction-B
PWB
[6] Jack Holder
(D)
[15] Junction-C
PWB
[10] Main PWB
[13] Speaker
Holder (s)
[9] Jack PWB
[14] Speaker (s)
[3] DVD Holder
[11] Stand Holder
[7] Digital Main
PWB Unit
[18] Function
PWB
[12] LCD Module
Assembly
[19] Front
Cabinet
[8] Jack Holder
(A)
[17] Junction-A
PWB
Step/
Loc.
No.
Part
Removal
Fig.
No.
Remove/*Unhook/
Unlock/Release/
Unplug/Unclamp/
Desolder
Note
[1] Stand
Assembly D1 3(S-1) ---
[2] Rear
Cabinet D1 10(S-2), 2(S-3), (S-4) ---
[3] DVD Holder D2
D5
4(S-5), 3(S-6),
*CN901, *CN902 ---
[4] DVD
Mechanism
D2
D5
(S-7), *CN201,
*CN301, *CN801
1
2
3
4
5
6
[5] DVD Main
PWB Unit D2 --------------- ---
[6] Jack
Holder(D) D3 (S-8) ---
[7] Digital Main
PWB Unit
D3
D5
4(S-9), (S-10),
4(S-11), 2(H-1),
*CN301, *CN302,
*CN303, *CN3902,
Shield Box
---
[8] Jack
Holder(A) D3 (S-12) ---
[9] Jack PWB D3
D5
4(S-13), CN702,
*CN861A ---
[10] Main PWB D3
D5
7(S-14), *CN102,
*CN201, *CN862A,
*CN1001, *CN1002
---
[11] Stand
Holder D4 2(S-15), (S-16) ---
[12]
LCD
Module
Assembly
D4 --------------- ---
[13] Speaker
Holder(s) D4 4(S-17) ---
[14] Speaker(s) D4 --------------- ---
[15] Junction-C
PWB
D4
D5 Desolder ---
[16] Junction-B
PWB
D4
D5 Desolder ---
[17] Junction-A
PWB
D4
D5 Desolder ---
[18] Function
PWB
D4
D5 2(S-18) ---
[19] Front
Cabinet D4 --------------- ---
(1) (2) (3) (4) (5)
Step/
Loc.
No.
Part
Removal
Fig.
No.
Remove/*Unhook/
Unlock/Release/
Unplug/Unclamp/
Desolder
Note

(No.YA711<Rev.002>)1-9
NOTE;
(1) Order of steps in procedure. When reassembling, follow
the steps in reverse order. These numbers are also used
as the Identification (location) No. of parts in figures.
(2) Parts to be removed or installed.
(3) Fig. No. showing procedure of part location
(4) Identification of parts to be removed, unhooked, un-
locked, released, unplugged, unclamped, or desoldered.
P = Spring, L = Locking Tab, S = Screw, H = Hex Screw,
CN = Connector * = Unhook, Unlock, Release, Unplug,
or Desolder e.g. 2(S-2) = two Screws (S-2), 2(L-2) = two
Locking Tabs (L-2)
(5) Refer to the following "Reference Notes in the Table."
REFERENCE NOTES
(1) CAUTION 1: Electrostatic breakdown of the laser diode
in the optical system block may occur as a potential dif-
ference caused by electrostatic charge accumulated on
cloth, human body etc., during unpacking or repair work.
To avoid damage of pickup follow next procedures.
a) Short the three short lands of FPC cable with sol-
der before removing the FFC cable (CN201) from
it. If you disconnect the FFC cable (CN201), the la-
ser diode of pickup will be destroyed. (Fig. D2)
b) Disconnect the Connectors (CN301), and
(CN801). Remove Screw (S-7) and remove the
DVD Main PWB Unit. (Fig. D2)
(2) Reassembly Notes of New DVD Mechanism:
a) To remove the Chassis Cover, remove two screws
A as shown in Fig. D2.
b) To avoid damage of the pickup unit (laser diode),
confirm that the three short lands (either of two
places) are shorted out by soldering between them
as shown in View A in Fig. D2.
c) Connect the FFC cables of the new DVD Mecha-
nism to the three connectors (CN201, CN301,
CN801) on the DVD Main PWB Unit.
d) After confirming that the FFC cables are securely
connected to the three connectors, remove the sol-
der from the three short lands. If the solder is not
removed, the laser diode will not light and it will not
be possible to read discs.
e) Insert the pin A on the Chassis Cover into the hole
A on the Main Chassis as shown in Fig. D2. Then
tighten two screws A to install the Chassis Cover.
(3) CAUTION 2: When reassembling, confirm the FFC cable
(CN201) is connected completely. Then remove the sol-
der from the three short lands of FPC cable. (Fig. D2)
(4) How to eject a disc in emergency
Press and hold [EJECT] on the unit for more than 5 sec-
onds.
(5) How to eject manually 1
a) Remove the Rear Cabinet.
b) Rotate the gear in the direction of the arrow as
shown below.
(6) How to eject manually 2
a) Remove the Rear Cabinet.
b) To remove the DVD Main PWB Unit, remove a
screw (S-7) in Fig. D2. Do not disconnect connec-
tors.
c) To remove the Chassis Cover, remove two screws
A as shown in Fig. D2.
d) Remove a disc.
View for B
The gear is turned to the direction
of the arrow.
B

1-10 (No.YA711<Rev.002>)
[2] Rear Cabinet
(S-1)
[1] Stand Assembly
(S-2)
(S-4)
(S-2)
(S-2)
(S-3)
Fig. D1

(No.YA711<Rev.002>)1-11
Remove two screws A, then short the three short lands by soldering as shown in View for A.
View for A
Either of two places
FPC Cable
Chassis Cover
Pin A
A
Hole A
Main Chassis
Screws A
(S-5)
(S-7) (S-6)
(S-6)
A
[5] DVD Main PWB unit
[4] DVD Mechanism
[3] DVD Holder
Fig. D2

1-12 (No.YA711<Rev.002>)
(S-8)
(S-9)
(S-9)
[9] Jack PWB
[6] Jack Holder(D)
[8] Jack Holder(A)
[10] Main PWB
[7] Digital Main
PWB Unit
(S-14)
(S-11)
(S-14)
(S-12)
Shield Box
(S-13)
(H-1) (S-10)
Fig. D3

(No.YA711<Rev.002>)1-13
(S-16)
(S-18)
(S-17)
(S-17)
[12] LCD Module
Assembly
[11] Stand Holder
[18] Function CBA
[13] Speaker
Holder
[13] Speaker
Holder
[15] Junction-C
CBA
[16] Junction
-B CBA
[17] Junction-A
CBA
[14] Speaker
[19] Front Cabinet
(S-15)
[14] Speaker
Fig. D4

1-14 (No.YA711<Rev.002>)
SECTION 4
ADJUSTMENT
4.1 GENERAL NOTE: "PWB" IS ABBREVIATION FOR
"CIRCUIT BOARD ASSEMBLY."
NOTE:
Electrical adjustments are required after replacing circuit com-
ponents and certain mechanical parts. It is important to per-
form these adjustments only after all repairs and replacements
have been completed. Also, do not attempt these adjustments
unless the proper equipment is available.
4.2 TEST EQUIPMENT REQUIRED
(1) NTSC Pattern Generator (Color Bar W/White Window, Red
Color, Dot Pattern, Gray Scale, Monoscope, Multi-Burst)
(2) Remote control unit
(3) Color Analyzer
4.3 HOW TO MAKE THE SERVICE REMOTE CONTROL
UNIT:
Cut "A" portion of the attached remote control unit as shown in
Fig. 1.
4.4 HOW TO SET UP THE SERVICE MODE:
Service mode:
(1) Use the service remote control unit.
(2) Turn the power on.
(3) Press the service button on the service remote control
unit. The following screen appears.
4.5 PURITY CHECK MODE
This mode cycles through full-screen displays of red, green, blue,
and white to check for non-active pixels.
(1) Enter the Service mode.
(2) Each time pressing [7] button on the service remote control
unit, the display changes as follows.
Fig. 1
service button
(There is a button under the plastic housing.)
A
Code :
Pic code :
MIPS :
***********-***
**-***-**-*****-***
Push 0key
Tuner :
Safety :
****-*****-****
safety_Non
"*" differs depending on the models.
[7] button
Note:
When entering this mode, the default setting is White mode.
Purity Check Mode
[7] button
Red mode
Green mode
Blue mode
Black mode
[7] button
White mode
[7] button
[7] button
White 20% mode
[7] button

(No.YA711<Rev.002>)1-15
4.6 VCOM ADJUSTMENT
(1) Operate the unit for more than 20 minutes.
(2) Set the color analyzer and bring the optical receptor to the
center on the LCD-Panel surface after zero point calibra-
tion as shown above. Note: The optical receptor must be
set perpendicularly to the LCD Panel surface.
(3) Enter the Service mode.
(4) Press [3] button on the service remote control unit.
(5) Press [CHANNEL UP/DOWN] buttons on the service re-
mote control unit so that the color analyzer value becomes
minimum.
4.7 WHITE BALANCE ADJUSTMENT
The white balance adjustment should be performed when
replacing the LCD Panel or Digital PWB.
Purpose: To mix red, green and blue beams correctly for pure
white.
Symptom of Misadjustment: White becomes bluish or reddish.
(1) Operate the unit for more than 20 minutes.
(2) Input the White Raster(70%=70IRE, 40%=40IRE).
(3) Set the color analyzer to the CHROMA mode and bring the
optical receptor to the center on the LCD-Panel surface af-
ter zero point calibration as shown above.
Note: The optical receptor must be set perpendicularly to
the LCD Panel surface.
(4) Enter the Service mode. Press [VOLUME DOWN] button
on the service remote control unit and select "C/D" mode.
(5) [CUTOFF]
Press [1] button to select “COR” for Red Cutoff adjustment.
Press [3] button to select “COB” for Blue Cutoff adjustment.
[DRIVE]
Press [4] button to select “DR” for Red Drive adjustment.
Press [6] button to select “DB” for Blue Drive adjustment.
(6) In each color mode, press [CHANNEL UP/DOWN] buttons
to adjust the values of color.
(7) Adjust Cutoff and Drive so that the color temperature be-
comes 12000°K (x= 0.272 / y= 0.278 ±0.005).
Test Point Adj. Point
Screen [CHANNEL UP/DOWN ]
buttons
M. EQ. Spec.
Color analyzer See below
Figure
Color Analyzer
To avoid interference from ambinent
light, this adjustment should be
performed in a dark room.
L = 3 cm
Perpendicularity
Test Point Adj. Point Mode Input
Screen
[VOLUME
DOWN]
button
[VIDEO1]
C/D
White Raster
(APL 70%)
or
(APL 40%)
M. EQ. Spec.
Pattern Generator,
Color analyzer
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Figure
Color Analyzer
L = 3 cm
Perpendicularity
INPUT: WHITE 70%, 40%
To avoid interference from ambinent
light, this adjustment should be
performed in a dark room.
40%=40IRE 70%=70IRE
100IRE
100IRE
0IRE 0IRE
INPUT SIGNAL
Low
Light
Hight
Light

1-16 (No.YA711<Rev.002>)
4.8 HOW TO INITIALIZE THE LCD TV/DVD
The purpose of initialization is to place the set in a new out of box condition. The customer will be prompted to
select a language and program channels after the set has been initialized.
To put the program back at the factory-default, initialize the LCD TV/DVD using the following procedure.
4.8.1 DVD SECTION
(1) Turn the power on.
(2) To enter the service mode, press the service button on the
service remote control unit.
- To cancel the service mode, press [POWER] button on
the service remote control unit.
(3) To put the LCD TV/DVD into the DVD mode, press [CH RE-
TURN] on the remote control unit.
(4) To put the LCD TV/DVD into the Flash clear mode, press
[INPUT SELECT] buttons on the remote control unit in that
order within five seconds. The following screen appears.
When "OK" appears on the screen, the factory default will
be set.
(5) To exit this mode, press[CHANNEL UP/DOWN] button to
go to TV mode, or press [POWER] button to turn the power
off.
4.8.2 LCD TV SECTION
(1) Turn the power on.
(2) To enter the service mode, press the service button on the
service remote control unit.
- To cancel the service mode, press [POWER] button on
the service remote control unit.
(3) Press [INFO] button on the service remote control unit to
initialize the LCD television.
(4) "INITIALIZED" will appear in the upper right of the screen.
"INITIALIZED" color will change to green from red when ini-
tializing is complete.
Flash Memory Clear : OK
CHUCKING ON

(No.YA711<Rev.002>)1-17
4.9 FIRMWARE RENEWAL MODE
4.9.1 DVD SECTION
(1) Turn the power on and press [EJECT] button on the remote
control unit to put the LCD TV/DVD into DVD mode. Then
remove the disc.
(2) To put the LCD TV/DVD into F/W version up mode, press
[9], [8], [7], [6], and [MODE] buttons on the remote control
unit in that order.
Fig. a appears on the screen.
(3) Insert the disc for version up into the disc slot.
(4) The LCD TV/DVD enters the F/W version up mode auto-
matically. Fig. b appears on the screen. Make sure to insert
the proper F/W for the state of this model.
The appearance shown in (*1) of Fig. b is described as fol-
lows:
(5) After programming is finished, the disc will be ejected auto-
matically. Fig. c appears on the screen and the checksum
will be shown in (*2).
At this time, no button is available.
(6) Remove the disc.
(7) Unplug the AC cord from the AC outlet. Then plug it again.
(8) Press [EJECT] button on the remote control unit to put the
LCD TV/DVD into DVD mode again.
(9) Press [1], [2], [3], [4], and [INFO] buttons on the remote
control unit in that order. Fig. d appears on the screen.
(10) Press [CLEAR] button on the remote control unit. Fig. e ap-
pears on the screen.
When “OK” appears on the screen, the factory default will
be set. Then the firmware renewal mode is complete.
(11) To exit this mode, press [CHANNEL UP/DOWN] button to
go to TV mode, or press [POWER] button to turn the power
off.
No. Appearance State
1 Reading... Sending files into the memory
2 Erasing... Erasing previous version data
3 Programming... Writing new version data
Fig. a Version Up Mode Screen
F/W Version Up Mode Model No : ******
VERSION : *.**
Please insert a DISC
for F/W Version Up.
EXIT: SELECT
"*******" differs depending on the models.
Fig. b Programing Mode Screen
VERSION : ************.***
Reading...
F/W Version Up Mode Model No : ******
VERSION : *.**
"*******" differ depending on the models.
(*1)
Fig. c Completed Program Mode Screen
VERSION : ************.***
Completed
SUM : ****
F/W Version Up Mode Model No : ******
VERSION : *.**
"*******" differ depending on the models.
(*2)
Fig. d
MODEL : ******
Version : *.**
Region : *
EXIT: SELECTEEPROM CLEAR : CLEAR
"*******" differs depending on the models.
Fig. e
MODEL : ******
Version : *.**
Region : *
EEPROM CLEAR : OK
EXIT: SELECTEEPROM CLEAR : CLEAR
"*******" differs depending on the models.

1-18 (No.YA711<Rev.002>)
4.9.2 LCD TV SECTION
4.9.2.1 EQUIPMENT REQUIRED
a. USB memory
b. Remote Control Unit
4.9.2.2 FIRMWARE UPDATE PROCEDURE
NOTE:
There are two states (the User Upgrade and the Factory Up-
grade) in firmware update.
The identification of User Upgrade and Factory Upgrade are
done by the filename.
(1) Turn the power off and unplug the AC Cord.
(2) Insert the USB memory to the USB port as shown below.
(3) Plug the AC cord in the wall outlet and turn the power on.
(4) The update will start and the following will appear on the
screen.
NOTE:
If the above screen isn’t displayed, repeat from step 1.
The appearance shown in *1 is described as follows.
(5) When the firmware update is completed, the following will
appear on the screen.
Unplug the AC cord and kindly remove the USB memory
from the USB port. Plug the AC cord in the wall outlet again
and turn the power on.
NOTE:
When the Factory Upgrade is used, after restarting TV,
shift to initial screen menu in service mode. "INITIAL-
IZED" will appear on the upper right of the screen. "INI-
TIALIZED" color will change to green from red when
initializing is complete.
User Upgrade Upgrade the firmware only. The
setting values are not initialized.
Factory upgrade Upgrade the firmware and initialize
the setting values.
Rear Cabinet
USB Memory
USB port
Software upgrade in progress. Please wait.
Do not remove the USB device or turn the TV off
while upgrade is in progress.
Software Upgrade
Downloading...
0%
*1
Appearance State
Downloading... Downloading the firmware from the USB
memory.
Writing... Writing the downloaded firmware in flash
memory.
Checking... Checking the new firmware.
Software Upgrade
The software upgrade is completed.
Remove USB storage device, unplug and replug power code.

(No.YA711<Rev.002>)1-19
SECTION 5
TROUBLESHOOTING
[ Power Supply Section ]
The power cannot be turned on.
The fuse blows out.
FLOW CHART NO.1
FLOW CHART NO.2
Is normal state restored when once unplugged
power cord is plugged again several seconds?
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(D601, D602, D603, D604, Q601, Q602, T601)
Ye s
No
Ye s
Is the fuse (F601) normal? See FLOW CHART No.2 <The fuse blows out.>
No
Ye s
Is the INV+31V line voltage normal? No
Check each rectifying circuit of the secondary
circuit and service it if defective.
Check the presence that the primary component
is leaking or shorted and service it if defective.
Check the presence that the rectifying diode or circuit
is shorted in each rectifying circuit of secondary side,
and service it if defective.
After servicing, replace the fuse.
When the output voltage fluctuates.
FLOW CHART NO.3
Does the photocoupler circuit on the
secondary side operate normally?
No
Ye s
Check IC601, D633, Q631 and their periphery
circuit, and service it if defective.
When buzz sound can be heard in the vicinity of power circuit.
FLOW CHART NO.4
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side,
and service it if defective. (IC631, IC901, Q201, Q205, Q206, Q634, Q635, Q636, Q637, Q640, Q641, Q643, Q901, Q903,
Q904, D631, D632, D636, D638, D639, D640, D641, D643)
Check D667, R655 and their periphery circuit, and
service it if defective.
INV+31V is not output.
FLOW CHART NO.5
Is approximately +31V voltage supplied to the
cathode of D632?
No
Ye s
Check C632, D632, D633 and their periphery
circuit, and service it if defective.
Check IC601, D608, D610 and their periphery,
circuit and service it if defective.

1-20 (No.YA711<Rev.002>)
Check Q202, Q203, D203, P-ON-H1 line and their
periphery circuit, and service it if defective.
PANEL+24.5V is not output.
FLOW CHART NO.6
Is approximately +30V voltage supplied to the collector
of Q205?
No
Ye s
See FLOW CHART No.5
Replace Q201.
Is approximately +13V voltage supplied to the
base of Q201?
Ye s
No
Check Q202, Q203, D201, D202, D210 and their
periphery circuit, and service it if defective.
No
PANEL+13V is not output.
FLOW CHART NO.7
Is approximately +15V voltage supplied to the
collector of Q201?
Ye s
Check C631, D631, D668 and their periphery circuit,
and service it if defective.
P-ON+7V is not output.
FLOW CHART NO.8
Is approximately +7V voltage supplied to the
cathode of D641?
Check C641, D641 and their periphery circuit,
and service it if defective.
Ye s
No
Check if there is any leak or short-circuit on
the loaded circuit, and service it if defective.
See FLOW CHART No.8
P-ON+5V is not output. (PANEL+13V is outputted normally.)
FLOW CHART NO.9
Is approximately +6.8V voltage supplied to the
collector of Q635?
Is approximately +6V voltage supplied to the
base of Q635 and the base of Q636?
No
Ye s
Ye s
Check D659 and their periphery circuit, and service
it if defective.
No
Replace Q635 and Q636.